import calendar

def get_date(year):
    list1 = []
    for i in range(1, 13):
        m = calendar.monthrange(year, i)
        start = "{}-{}-01".format(str(year), str(i).zfill(2))
        end = "{}-{}-{}".format(str(year), str(i).zfill(2), m[1])
        arrangement = start + end
        list1.append(arrangement)
    print(list1)
get_date(2020)
